Multiline trailing comma rule flags type parameters 2

[mizunashi-mana]

Bug Report

• TSLint version: 4.1.1
• TypeScript version: 2.1.4
• Running TSLint via: gulp-tslint

TypeScript code being linted

var foo = <
  A,
  B
>(a: A, b: B) => 42;
function foo(a: [
  number,
  string
]): void {
  return 42; 
}

with tslint.json configuration:

{
    "trailing-comma": [true, {"multiline": "always", "singleline": "never"}]
}

Actual behavior

var foo = <
  A,
  B
   ~ [Missing trailing comma]
>(a: A, b: B) => 42;
function foo(a: [
  number,
  string
  ~ [Missing trailing comma]
]): void {
  return 42; 
}

This is invalid typescript code. Related: #1769

Expected behavior

var foo = <
  A,
  B
>(a: A, b: B) => 42;
function foo(a: [
  number,
  string
]): void {
  return 42; 
}

[nchen63]

also from #1769, this fails:

function foo(a: [
  number,
  string
  ~ [Missing trailing comma] // expecting no warnings
]): void {
  return 42; 
}